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ABSTRACT

LIGHT PENN DETECTION AND VERIFICATION ARRANGEMENT FOR DISPLAY SYSTEM ALLOWING OPERATOR SELECTION OF ONE OR MORE PORTIONS OF A FORMATTED MESSAGE, FORMAL IS ESTABLISHED BY INCLUDING A NON-DISPLAYABLE FIELD SEPARATOR CHARACTER FOLLOWED BY A DESIGNATOR CHARACTER AND ONE OR MORE DISPLAYABLE ALPHAMERIC CHARACTERS. THE FIELD SEPARATOR CHARACTER INCLUDES BITS WHICH IDENTIFY. THE FIELD AS BEING DETECTABLE AND A TAG BIT TO INDICATE WHEN DETECTION HAS BEEN MADE IN THE ASSOCIATED FIELD. WHEN A FIELD PRECEDED BY A ? IS DETECTED THE TAG BIT OF THE FIELD SEPARATOR CHARACTER IS SET ON AND THE ? IS CHANGED TO A &gt; PROVIDING A VISUAL VERIFICATION OF THE SELECTION. IF THE ORIGINAL SELECTION IS TO BE CHANGED, THE ORIGINAL FIELD IS AGAIN SELECTED, THE TAG BIT IS RESET OFF AND THE &gt; IS RETURN TO A ? TO PROVIDE VISUAL VERIFICATION OF THE DESELECTION, A FIELD WHICH IS PRECEDED BY A SPACE OR NULL DESIGNATOR CHARACTER IF SELECTED WILL CAUSE THE TAG BIT OF THE ASSOCIATED FIELD SEPARATOR CHARACTER TO BE SET ON WITH NO CHANGE OCCURING IN THE DESIGNATOR CHARACTER REPRESENTATION BUT A SIGNAL IS GENERATED WHICH WILL LEAD TO A READING OF THE TAGGED FIELDS OF THE SYSTEM MESSAGE.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice 01! Dec.16, 1969, 869 0.0. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files orthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits or alleged invention. The Patent Oiilce makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED OCTOBER 30, 1973 T915,0i3 SELECTOR LIGHT PEN SYSTEM RichardAlfred Jones, Redhoolt, Theodore Edwin Larson,

Saugerties, Kenneth Rogers McNary, Hyde Park, Lawrence Gedney Masher,Rhinebeck, William Roosevelt Vincent, Poughkeepsie, and James TheodoreZahorsky, Saugerties, N.Y., assignors to International Business MachinesCorporation, Armonk, N.Y.

Filed Nov. 17, 1972, Ser. No. 307,759 Int. Cl. G06f 3/14 US. Cl. 340-324AD 5 Sheets Drawing. 29 Pages Specification MESSAGE BUFFER LIGHT AID BHEP n INPUT/OUTPUT CONTROL SWITCH CONTROL 51mg INIERFACE comm. DISPLAYSlAiION 18 Light pen detection and verification arrangement for adisplay system allowing operator selection of one or more portions of aformatted message. Format is established by including a non-displayablefield separator character followed by a designator character and one ormore displayable alphameric characters. The field separator characterincludes bits which identify the field as being detectable and a tag bitto indicate when detection has been made in the associated field. When afield preceded by a is detected, the tag bit of the field separatorcharacter is set on and the 7 is changed to a providing a visualverification of the selection. If the original selection is to bechanged, the original field is again selected, the tag bit is reset oiland the is returned to a to provide visual verification of thedeselection. A field which is preceded by a space or null designatorcharacter if selected will cause the tag bit of the associated fieldseparator character to be set on with no change occurring in thedesignator character representation but a signal is generated which willlead to a reading of the tagged fields of the system message.

Oct. 30, 1973 SELECTOR LIGHT PEN SYSTEM Filed Nov. 17, 1972 5Sheets-Sheet 1 TsT SCAN L|NE(L|NE 2) 40 T 480 BYTES I /50 MESSAGE LINE:Wfi 52 BUFFER RNETER E 58 N DIGITAL 22 T 26/ 4 sERTAETzER O 0 E '5 T Ti i A4 5 44 24 TIMING O I A 0 1 a & 36 l CONTROL TNTENsTTY T L CONTROLINS =DRAW BARS DEL LIGHT AIDBYTE' PEN NWT/OUTPUT HTENHQN CONTROL LPSWITCH DEPRESSED I CONTROL F 7 LP sTRTNE A I RESET I N 4O 58 18TNTEREAOE CONTROL DISPLAY STATION 18 V TRANSMISSION CENTRAL CONTROLPROCESSING T UNIT sYsTEN 16 12 Oct. 30, 1973 JONES ETAL T915,013

SELECTOR LIGHT PEN SYSTEM Filed Nov. 17, 1972 5 Sheets-Sheet 2 SCAN EHPH HE HH ETHE if; A w-C CHARACTER T A g:

HORIZONTAL CHARACTER sPACE CHARACTER ROW w Oct. 30, 1973 JONES ETALT915,013

SELECTOR LIGHT PEN SYSTEM Filed Nov. 17, 1972 5 Sheets-Sheet f5 FIG.3

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